摘要|Why use static types in JavaScript? (A 4-part primer on static typing with Flow)
      
      
      
        
          
          
原文参见Why use static types in JavaScript
part one  Flow 的快速介绍boolean描述boolean值1var isFetching: boolean = false;
numbernumber 包含了Infinity和NaN123var luckyNumber: number = 10;var notSoLuckyNumber: numb
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